June 12, 2017 AT 6:00 am

LED Light With PIR Motion Sensor, Soft On/off and 2yr Battery Life

A friend needed a light for a basement storage room with no mains electricity available.

Wishes:

assume 1 minute of ON time per day,
works from cheap and common batteries,
long battery life (1 year+),
possibly hands-free operation.
I decided to use a widely available hobby PIR sensor board as the switch and design around that, aiming for 2 years of battery service.